ARCHIVED REPORTS_1979 - Laserfiche WebLink

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5A PROJECT DEFINITION General In this chapter, the feasibility of converting the transfer sta- tion into a resource recovery facility capable of recovering fer- rous metals and producing steam or electric power from the waste stream is analyzed. For purposes of this analysis , an energy conversion system utilizing modular, package incinerators with integral waste heat boiler is conceptualized. A package incinerator/power plant requires only simple pre- processing to prepare the refuse for combustion. A process flow diagram is presented in Figure 5-1. As received, refuse is pro- cessed in order to separate its non-combustible and combustible fractions. The combustible fraction is the refined fuel product. Thermal energy in the combustion gases converts water to steam in the unit' s boiler. The steamproduced can be sold directly or used to drive a turbogenerator to generate electricity. From the non-combustible fraction, ferrous metals are removed with the re- maining residues landfilled. The plant has been designed with four incincerator units , each rated at two tons per hour. One unit will be used for stand-by and maintenance scheduling, while the other units will be on-line combusting refined fuel 24 hours per day, 7 days per week. Addi- tional units can be added at a later date to handle increased future tonnage., Facility Description All commercial vehicles delivering MSW for processing will dis- charge their loads on the transfer station tipping floor. The station, which has been modified to accomodate the package incin- erator plant addition, now has a sunken steel pan apron conveyor included to start the pre-processing operation. From the tipping floor, a front-end loader is used to feed the apron conveyor. The unprocessed refuse is transferred from the apron conveyor to an inclined steel pan cleated conveyor. This conveyor, which levels off to a horizontal position, feeds a trom mel which is declined about 3 to 5 degrees with 4 . 75 inch diameter holes. Refuse undergoes a tumbling, tearing action as it progresses through the trommel. Approximately 50 percent of the incoming refuse drops through the holes. A high percentage of this drop- out is non-combustible. The dropout is transported by a rubber belt conveyor to a storage bin from which it is loaded into trucks for landfill. Prior to being deposited into the storage bin, a magnetic head pulley located at the end of the belt conveyor removes approximately 50 percent of the ferrous product contained in the dropout fraction. 27